Full source code to use the Parcelable interface, which is a faster alternative to Java’s Serializable interface, to send a custom object from our MainActivity to another activity, after we click that particular item in a RecyclerView
Activity2.java
package tech.codingpoint.parcelableexample;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;
public class Activity2 extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);
Intent intent = getIntent();
ExampleItem exampleItem = intent.getParcelableExtra("Example Item");
int imageRes = exampleItem.getImageResource();
String line1 = exampleItem.getText1();
String line2 = exampleItem.getText2();
ImageView imageView = findViewById(R.id.image_activity2);
imageView.setImageResource(imageRes);
TextView textView1 = findViewById(R.id.text1_activity2);
textView1.setText(line1);
TextView textView2 = findViewById(R.id.text2_activity2);
textView2.setText(line2);
}
}
activity2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="tech.codingpoint.parcelableexample.Activity2">
<ImageView
android:id="@+id/image_activity2"
android:layout_width="100dp"
android:layout_height="100dp" />
<TextView
android:id="@+id/text1_activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp" />
<TextView
android:id="@+id/text2_activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp" />
</LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.codinginflow.parcelableexample.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray"
android:padding="4dp"
android:scrollbars="vertical" />
</RelativeLayout>
example_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:padding="2dp" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/imageView"
android:text="Line 1"
android:textColor="@android:color/black"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView"
android:layout_marginStart="8dp"
android:layout_toEndOf="@+id/imageView"
android:text="Line 2"
android:textSize="15sp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
ExampleAdapter.java
package com.codinginflow.parcelableexample;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
private ArrayList<ExampleItem> mExampleList;
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
public static class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextView1;
public TextView mTextView2;
public ExampleViewHolder(View itemView, final OnItemClickListener listener) {
super(itemView);
mImageView = itemView.findViewById(R.id.imageView);
mTextView1 = itemView.findViewById(R.id.textView);
mTextView2 = itemView.findViewById(R.id.textView2);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (listener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position);
}
}
}
});
}
}
public ExampleAdapter(ArrayList<ExampleItem> exampleList) {
mExampleList = exampleList;
}
@Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item, parent, false);
ExampleViewHolder evh = new ExampleViewHolder(v, mListener);
return evh;
}
@Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
ExampleItem currentItem = mExampleList.get(position);
holder.mImageView.setImageResource(currentItem.getImageResource());
holder.mTextView1.setText(currentItem.getText1());
holder.mTextView2.setText(currentItem.getText2());
}
@Override
public int getItemCount() {
return mExampleList.size();
}
}
ExampleItem.java
package com.codinginflow.parcelableexample;
import android.os.Parcel;
import android.os.Parcelable;
public class ExampleItem implements Parcelable {
private int mImageResource;
private String mText1;
private String mText2;
public ExampleItem(int imageResource, String text1, String text2) {
mImageResource = imageResource;
mText1 = text1;
mText2 = text2;
}
protected ExampleItem(Parcel in) {
mImageResource = in.readInt();
mText1 = in.readString();
mText2 = in.readString();
}
public static final Creator<ExampleItem> CREATOR = new Creator<ExampleItem>() {
@Override
public ExampleItem createFromParcel(Parcel in) {
return new ExampleItem(in);
}
@Override
public ExampleItem[] newArray(int size) {
return new ExampleItem[size];
}
};
public int getImageResource() {
return mImageResource;
}
public String getText1() {
return mText1;
}
public String getText2() {
return mText2;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(mImageResource);
dest.writeString(mText1);
dest.writeString(mText2);
}
}
MainActivity.java
package com.codinginflow.parcelableexample;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ArrayList<ExampleItem> mExampleList;
private RecyclerView mRecyclerView;
private ExampleAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createExampleList();
buildRecyclerView();
}
public void createExampleList() {
mExampleList = new ArrayList<>();
mExampleList.add(new ExampleItem(R.drawable.ic_android, "Line 1", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_audio, "Line 3", "Line 4"));
mExampleList.add(new ExampleItem(R.drawable.ic_sun, "Line 5", "Line 6"));
}
public void buildRecyclerView() {
mRecyclerView = findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mAdapter = new ExampleAdapter(mExampleList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
mAdapter.setOnItemClickListener(new ExampleAdapter.OnItemClickListener() {
@Override
public void onItemClick(int position) {
Intent intent = new Intent(MainActivity.this, Activity2.class);
intent.putExtra("Example Item", mExampleList.get(position));
startActivity(intent);
}
});
}
}